What is the difference of inheriting a class to use its member and creating an object of that class to use its member?

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C#

inheritance

As we can access the members of a class by creating an instance of it why do we need to use inheritance to use and access its members.Class 1 and Class 2 are the two classes. I want to access all the members of Class 1 inside class 2. I can instantiate a object of class 1 inside Class 2 as well as inheriting the class 1 in the sub class to access the members. I would to like to know why one is preferred and in what kind of situation.

What I have tried:

I have worked on both creating a instance of the class and inheriting in a sub class to access the members of the class.But i don't know why use inheritance is preferred.